Injecting nozzle for viscous fuels in diesel engines



Patented 3, 192,9

UNITED STA-'rss PATENT OFFICE RUDOLF GI'ALUPP, 0F COLOGNE-ON-THE-RHINE,GERM-ANY, ASSIGNOR TO MOTOREN- FAIBRIK DEUTZ AKTIENGESELLSCHAFT, OFCOLOGNE-DEUTZ, GERMANY INJCTING NOZZLE FOB VISCOUS FUELS IN DIESELENGINMES applicati@ mea November s, 1926, seal No.

In the treatment olf viscous fuels in closed nozzles for Diesel engineswith airless injec tion the disadvantage arises, particularly when thenozzle body is of rather large dimensions, that the latter becomes socool in the upper part that the oil leaking past between the valvespindle and its guide, owing to its excessive viscosity, exerts aretarding action. It has indeed already been proposed to preheat theviscous fuel oil in order to enable it to be forced with suicientmobility through g which holds it fast, an annular cap has been formed,and the latter is provided with ducts which extend right to the upperpart of the .spindle guidev and are open at thev top or closed to theoutside. These spaces are filled with a liquid which is adapted toexecute a thermal circulation and thus to give off heat atl the lowerpart of the nozzle guide owing to' this circulation. For this purposethe liquid must not have too high a viscosity at the workingtemperature, must have sufficient 'power to take up heat at metalsurfaces, and

must not have too low a boiling point, in order 'to guard againstthe-.formation of vapour as far as possible. It has been found thatlubrieatingl oil possesses the properties required for this purpose.

One constructional form of the invention is illustrated in theaccompanying drawings,

wherein 'Figs 1 and 2 show two sectional elevations through the nozzlebody taken on the lines I-I in Fig. 3 and II-II in Fig. 4 respectively.

Figs. 3 and 4 are sections taken on the lines A-B in Fig. 1, and C-D inFig. 2 respectively.

In the nozzle body Itis inserted the nozzle 146,468, and 4in GermanyNovember 26, 1925.

' only raised when motor oil is forced at a high pressure through theangular duct f in the l nozzle body'a from a fue pump, not shown,connected yto the nozzle vbody at 0. Since the nozzle body hasto beinserted into a water,

cooled sleeve min the cylinder head, the spinv.dle i must inevitably beclamped or atleast checked in its movability in its upper part, pastwhich'the leakage oil under high pressure is forced between the spindleand its guide. i v

In order to obviate this, the following arrangement is provided: Betweenthe nozzle cap c and the cap d an annular clearance space gis left,which communciates by ducts h, h with the upper part of the nozzle body.The ducts k, h are filled with lubricating oil, and at the top areeither open or are closed by plugs le.

The action is as follows: When the engine is working, both the cap d andthe'nozzle plate c arehighly heated by-the combustion, and thereforegive up heat to the liquid filling the annular space. Convectioncurrents now start in the up er parts of the ducts h, h, which are-preerably of greater cross-sec tional areal than the lower parts, and thereexert a heating influence through the guide of the spindle i, to such anextent that the leakage oil that is forced through remains sufficientlythin or mobile not to retard the for use in Dieselengines, consisting ofa nozzle body secured in the cylinder of the engine and enclosing themovable valve members that effect the injection of the fuel into thecylinder, said valvemembers being surrounded by cavities which servefor. the reception of liquid and extend from the'lower part to the upperpart of the nozzle body to give up there to the nozzle body the heatwhich the filling liquid takes u from the lower part of the nozzle body,W ich becomes hot when the engine is in operation, said cavities formingan annular chamber connected With ducts traversing the nozzle body, andsaid annular chamber surrounding the valve plate secured to the movablespindle enclosed by the nozzle body, and the adjustable seat for saidvalve plate.

2. An injecting nozzle for viscous fuels, for use in Diesel engines,consisting of a nozzle body secured in the cylinder of the engine andenclosing the movable valve members that effect the injection of thefuel into the cylinder, said valve members being surrounded by cavitiesWhich serve for the reception of liquid and extend from the lower partto the upper-part of the nozzle body to give up there to the nozzle bodythe heat which the illing liquid takes up from the lower part of thenozzle body, which becomes -hot when the engine is in operation, saidcavities forming an annular chamber connected With ducts traversingthenozzlebody, and said annular chamber surrounding the valve plate securedto the movable spindle venclosed by the nozzle body, and the adjustableseat for said valve plate, the ducts traversing .the valve body havingbores of larger diameter at the upper part remote from the cylinder thanat the lower part adjacent to the cylinder, and being closed ,'byclosure membersat the atmosphere.

3. An injection nozzle for viscous fuels, for use in Diesel engines withairless in'ection, consisting of a nozzle body, secure inv the cylinderof the engine and enclosing the movable valve members that effect theinjection of the fuel into the cylinder, the said valve members beingsurrounded by cavities in the nozzle body Which do not communicate withthe interior of the engine cylinder but serve for the reception of asmall quantity of liquid, which absorbs heat from the lower parts of thevalve members adjacent to the cylinder space and gives it upto the outerportions of the nozzle body, owing to convection current arising in theliquid Within the said cavities, thereby Warming the lubricating oilbetween the nozzle body and the valve spindle. y

In testimony whereof I have signed my name to this specification.

RUDOLF GAUPP.

places Where they open to the

